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Sticky Note
HCF of x^2 - y^2 and x^2 - xy is?
  1. x + y
  2. x - y
  3. -x + y
  4. None of these
Explanation

Let's factor:

x^2 - y^2 = (x + y)(x - y)

x^2 - xy = x(x - y)

The common factor is (x - y).

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